如何打开csv文件，逐行读取文件，执行base64_decode()操作，并将解码后的数据写入新文件？

import csv
import base64

with open('input.csv', 'r') as csvfile, open('output.csv', 'w') as outfile:
    reader = csv.reader(csvfile)
    writer = csv.writer(outfile)

    for row in reader:
        decoded_row = []
        for item in row:
            decoded_item = base64.b64decode(item).decode('utf-8')
            decoded_row.append(decoded_item)

        writer.writerow(decoded_row)

import csv
import base64

with open('input.csv', 'r') as csvfile, open('output.csv', 'w') as outfile:
    reader = csv.reader(csvfile)
    writer = csv.writer(outfile)

    for row in reader:
        decoded_row = []
        for item in row:
            decoded_item = base64.b64decode(item).decode('utf-8')
            decoded_row.append(decoded_item)

        writer.writerow(decoded_row)